10-5.c

提供了许多进程间通信的实例程序。用linux下的C语言实现。

#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>

int main(void)
{
        char write_fifo_name[] = "read-fifo";
        char read_fifo_name[] = "write-fifo";
        int write_fd, read_fd;
        char buf[256];
        int len;

        int ret = mkfifo(write_fifo_name, S_IRUSR | S_IWUSR);
        if ( ret == －1) {
                printf("Fail to create FIFO %s: %s", write_fifo_name, strerror(errno));
                exit(－1);
        }

        while ((read_fd = open(read_fifo_name, O_RDONLY)) == －1) {
                sleep(1);
        }

        write_fd = open(write_fifo_name, O_WRONLY);
        if (write_fd == －1) {
                printf("Fail to open FIFO %s: %s", write_fifo_name, strerror(errno));
                exit(－1);
        }

        while (1) {
                len = read(read_fd, buf, 256);
                if ( len > 0) {
                        buf[len] = '\0';
                        printf("Lucy: %s\n", buf);
                }
                printf("Peter: ");
                fgets(buf, 256, stdin);
                buf[strlen(buf)－1] = '\0';
                if (strncmp(buf,"quit", 4) == 0) {
                        close(write_fd);
                        unlink(write_fifo_name);
                        close(read_fd);
                        exit(0);
                }
                write(write_fd, buf, strlen(buf));
        }
}